#include <stddef.h>
#include <stdio.h>
void f(size_t n){
    /* n must be incremented */
    size_t a = sizeof(int[++n]);
    /* n need not be incremented */
    size_t b = sizeof(int[++n % 1 + 1]);
    printf("%z,%z,%z\n",a,b,n);
    /* ... */
}